Further operation implementation

1 files changed, 70 insertions, 0 deletions

diff --git a/build/operation b/build/operation
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+// file      : build/operation -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef BUILD_OPERATION
+#define BUILD_OPERATION
+
+#include <string>
+#include <cstdint>
+#include <iosfwd>
+
+#include <build/utility> // string_table
+
+namespace build
+{
+  // While we are using uint8_t for the meta/operation ids, we assume
+  // that each is limited to 4 bits (max 128 entries) so that we can
+  // store the combined action id in uint8_t as well. This makes our
+  // life easier when it comes to defining switch labels for action
+  // ids (no need to mess with endian-ness).
+  //
+  // Note that 0 is not a valid meta/operation/action id.
+  //
+  using meta_operation_id = std::uint8_t;
+  using operation_id = std::uint8_t;
+  using action_id = std::uint8_t;
+
+  struct action
+  {
+    action (meta_operation_id m, operation_id o): id ((m << 4) | o) {}
+
+    meta_operation_id
+    meta_operation () const {return id >> 4;}
+
+    operation_id
+    operation () const {return id & 0xF;}
+
+    // Implicit conversion operator to action_id for the switch()
+    // statement, etc.
+    //
+    operator action_id () const {return id;}
+
+    action_id id;
+  };
+
+  std::ostream&
+  operator<< (std::ostream&, action);
+
+  // Id constants for build-in operations.
+  //
+  const meta_operation_id perform_id   = 1;
+  const meta_operation_id configure_id = 2;
+  const meta_operation_id disfigure_id = 3;
+
+  const operation_id update_id = 1;
+  const operation_id clean_id  = 2;
+
+  const action_id perform_update_id = (perform_id << 4) | update_id;
+  const action_id perform_clean_id  = (perform_id << 4) | clean_id;
+
+  // Meta/operation id tables.
+  //
+  using meta_operation_table = string_table<meta_operation_id>;
+  using operation_table = string_table<operation_id>;
+
+  extern meta_operation_table meta_operations;
+  extern operation_table operations;
+}
+
+#endif // BUILD_OPERATION